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Upcoming Races Near Grand County, CO

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Calarat Challenge Trail Running Festival

Jamestown, CO

Saturday, August 30th, 2025

Half

10K

5K

Trail

View details for race Calarat Challenge Trail Running Festival

10k at 10,000 Feet

Steamboat Springs, CO

Sunday, August 31st, 2025

Trail

View details for race 10k at 10,000 Feet

Oak Creek No Fun Run

Oak Creek, CO

Monday, September 1st, 2025

5K

View details for race Oak Creek No Fun Run

Cirque Series - Arapahoe Basin, CO

Keystone, CO

Saturday, September 6th, 2025

Trail

View details for race Cirque Series - Arapahoe Basin, CO

Buffalo Bicycle Classic

Boulder, CO

Sunday, September 7th, 2025

Ultra

View details for race Buffalo Bicycle Classic

Emerald Mountain Trail Run

Steamboat Springs, CO

Saturday, September 27th, 2025

View details for race Emerald Mountain Trail Run

Estes Epic

Estes Park, CO

Saturday, September 27th, 2025

Ultra

Trail

View details for race Estes Epic

Boulder XC Series Meet 1

Boulder, CO

Saturday, October 11th, 2025

5K

View details for race Boulder XC Series Meet 1

Breckenridge Road Marathon

Breckenridge, CO

Saturday, October 11th, 2025

View details for race Breckenridge Road Marathon

Boulder Turkey Trot Training Program

Boulder, CO

Wednesday, October 15th, 2025

View details for race Boulder Turkey Trot Training Program

Foundry Halloween 5k

Steamboat Springs, CO

Saturday, October 25th, 2025

5K

Trail

View details for race Foundry Halloween 5k

Halloween Fun Run 5k & 1mile - Zombie Theme

Idaho Springs, CO

Saturday, October 25th, 2025

5K

1 Mile

View details for race Halloween Fun Run 5k & 1mile - Zombie Theme

Colleen De Reuck XC Classic

Boulder, CO

Saturday, November 1st, 2025

5K

View details for race Colleen De Reuck XC Classic

Alpine Bank Boulder Thanksgiving Day 5K

Boulder, CO

Thursday, November 27th, 2025

5K

View details for race Alpine Bank Boulder Thanksgiving Day 5K

TEST RACE

Boulder, CO

Wednesday, December 31st, 2025

View details for race TEST RACE

Friends of the National Center Science Stride 5K

Boulder, CO

Friday, May 1st, 2026

5K

View details for race Friends of the National Center Science Stride 5K

Summits Trail Runs

Granby, CO

Saturday, June 6th, 2026

10K

12K

Trail

View details for race Summits Trail Runs

Explore more in Grand County, CO

Distances:

5K 10K Half Marathon Marathon

Months:

August September October

Tags:

Trail Boston Qualifiers Fast Courses

State:

All Colorado races

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